Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Biodegradable bursting release system










Image Number 4 for United States Patent #5429822.

A biodegradable polymeric multiphasic release system of one or more biodegradable bursting units capable of delivering biologically active substances in a burst or pulse at predetermined times and a method for constructing those units is disclosed. The individual bursting units of the system may take the form of a biodegradable, membrane coated capsule surrounding a core material which may include an active agent. The membrane ruptures after a predetermined time upon exposure to water or bodily, or other aqueous environmental fluids. The bursting units may be used in any situation in which a controlled pulsed release of an active substance is desired. The predetermined time release of each bursting unit is controlled by the composition of the core material, the initial radius and wall thickness of the membrane and the porosity of the membrane. The core material may also contain a chemical composition which generates gas as fluid is drawn into the bursting unit thus adding an additional design variable for predetermining bursts.








 
 
  Recently Added Patents
Transmitter and receiver for streaming media including packet padding
Carrying case
Electronic device
Method and CTDevice for computer tomographic spiral scanning of a patient
System and method for ensuring compliance with organizational policies
System and method for detecting malicious code executed by virtual machine
Methods for enhancing tantalum filament life in hot wire chemical vapor deposition processes
  Randomly Featured Patents
Imidazo-benzothiazoles
Labile bromine fire suppressants
Contact lenses providing improved visual acuity
Antiinflammatory 1-acyl-3(5)-alkyl-5(3)-phenyl-1,2,4-triazoles
Suspension struts
Exerciser light alarm stick
Optical information recording medium having protective layer
Color switching projection apparatus with two liquid crystal panels
Apparatus for cleaning a floor cover
Method of forming contact